Liquid-spraying apparatus



March 31, 1925.

G- L. STACKPOLE LIQUID SPRAYING APPARATUS Filed Aug. 1, 1922 l-lavenjl'u7' Patented Mar. 31, 1925.

GEORGE L. srAcKPoLE, or BANGOR, MAINE.

LIQUID-SPRAYING APPARATUS.

Application filed August 1, 1922. Serial No. 578,870.

To all whom it may concern:

Be it known that I, GEORGE L. STACKPOLE, a citizen of the United States,residing in Bangor, in the county of Penobscot and State of Maine, haveinvented an Improve- -ment in Liquid-Spraying Apparatus, of

which the following description, in connect1on with the accompanyingdrawings, isa

specification, like characters on the drawings representing like parts.I

This invention relates to ana paratus for spraying liquids andparticular y paint and like liquids. The invention has for its object toprovide a simple, efficient and inexpeisive apparatus for the'purposespeci- The apparatus comprises a paint tank or container, and a paintgun of novel construction, as will be described, which is connected withthe paint'container for the passage of liquid paint and air.

The particular features of the invention will be pointed out in theclaims at the end of this specification.

Fig. 1 is an elevation and section of an apparatus embodying thisinvention.

Fig. 2, a partial plan and section of the gun shown in Fig. 1. v

Fig. 3, a section on the line 3-3, Fig. 2, and

Fig. 4, a longitudinal section on an enlarged scale of a portion of thegun, taken on the line 4-4, Fig. 3.

Referring to the drawings, (1. represents a tank or container for thepaint or other liquid to be sprayed. The tank a is provided with aremovable cover I) which is preferably proyided with a screw threadedflange c to engage screw threads on the body por tion of the tank.

The cover b in accordance .with this invention has secured to it a pipesection or nipple 10, to which is connected an air pipe or hose 12leading to a 'pipe section 13 provided with a valve 14, for controllingthe admission of air under pressure into the tank a. The cover I) isalso provided with a removable cap or plug 15 normally closing an inletport through which the tank may be filled with paint or other liquid,indicated by the dotted line 16. The cover I) is further provided with apipe 17 which is of sufficient length to extend into the tank a to nearthe bottom thereof, preferably to about half an inch from said bottom.The pipe 17 constitutes a paint outlet pipe for the tank and. hasdetachably secured to its end above the cover I) by a coupling 18, ahose or pipe 1.9 which may be of any suitable or desired length, whichhas its other end detachably connected, as by a coupling20, to a met a1pipe 21 forming the paint conducting member of a paint gun.

The'pipe 21 has welded or otherwise secured to it a metal pipe 22arranged lengthwise thereof and constituting the air conducting memberof said paintgun. The air pipe 22 has one end connected as by a coupling 23, with one end of a flexible hose or pipe 24, whose other end isconnected by the coupling 240 with the pipe section 13, which has abranch pipe 25 which is connected by a hose or pipe 26 with a suitablesource of supply for air under pressure.

The paint and air pipes 21, 22 of the paint gun are provided withelongated and substantially narrow outlet mouths 27, 28 re spectively,see Fig. 3, which may be obtained by contracting or flattening thecylindrical pipes at their outlet ends.

The air outlet mouth 28 is preferably made-narrower than the paintoutlet mouth 27, and the outlet end of the paint pipe 21 is curvedtoward the longitudinal axis of the air pipe 22, as represented in Figs.2 and 4, so that the outlet mouth 27 of the paint pipe will dischargethe paint transversely with relation to the path of the air streamissuing from the mouth 28 of the air pipe, with the result that thepaint stream ture of the paint and air is effected within a relativelylarge atomizingchamber 30, preferably formed by a nozzle 31 whichencircles the outlet ends ofthe paint and air pipes 21, 22 and isprovided with an elongated narrow discharge mouth 32' whose longerdimension extends in the same direction as that of the outlet mouths ofthe air and paint pipes. The nozzle 31 may be a piece of pipe which isflattened at its outlet end as represented in Figs. 1 and 2, and whoserear end is externally threaded to engage the internal threads of a,collar 33 which is soldered, welded or otherwise secured to the paintand air ipes 21, 22, as represented in Fig. 2.

The paint issuing from the paint pipe 21 is broken up or atomized withinthe nozzle 31 and is projected out therefrom through the narrow outletmouth 32 of the nozzle 1n the form of a still finer spray under theinfluence of the air pressure, which is of suflicient "force to projectthe spray upon objects located as far as six feet from the nozzlethereby enabling objects in inaccessible places to be coated with paint.7

The paint pipe of the gun may and preferably will be provided with avalve 34: by which the flow of paint to the nozzle 31 may be controlledby the operator handling the From the above description, it will be seenthat the air pipe. section 10 and the paint outlet pipe 17 are carriedby the removable cover b, which enables these pipes to be re moved fromthe tank or container a with the cover, which leaves the tank free orunobstructed for the purpose of cleaning the same.

it will also be noticed that the air pipe 10 terminates near theunderside of the cover and above the level of the paint therein, whichenables the air under pressure to act on the body of paint or otherliquid in the tank, to :torce it out through the pipe 17, withoutagitating or stirring up the paint, and further prevents the paintdowing back into the air pipe. Furthermore, by disconnecting the hose 19from the outlet pipe 17 and connecting the air pipe 12 with the pipe 17,air under pressure may be forced through the paint to agitate the same,which may be desirable in cases where the apparatus has not been usedfor a number of days and the paint has been allowed to stand in thetank.

It will also be observed that the elongated mouths of the paint and airpipes 27, 28 of the gun, cause the paint and air to issue therefrom insubstantially thin wide streams, and by shaping the end of the paintpipe so that its outlet mouth will cause the paint stream to flow acrossthe air stream, an at ficient breaking up of the paint stream isaffected and an initial spraying of the aint within the nozzle isaccomplished, which in itial spraying or atomizing of the paint issupplemented by the atomizing action of the elongated narrow mouth ofthe nozzle 31,

from which the paint issues in a substantially flat wide stream offinely divided paint, which is projected by the air pressure away fromthe gun in the form of a fine spray.

Claims:

1. In an apparatus of the character de scribed, a paint gun comprisingan air conducting pipe having an elongated substantially narrow outletmouth, a paint conducting pipe arranged lengthwise of said airconducting pipe and provided with an elon gated substantially narrowmouth arranged with relation to the mouth of the air pipe to dischargeliquid paint transversely with relation to the air stream issuing fromthe mouth of said air conducting pipe, and a nozzle having its rear endencircling the paint and air pipes to form an atomizing chamber andprovided with an elongated substantially narrow mouth to cause the aintatomized within the nozzle to be proected therefrom in a finer spray.

2. In an apparatus of the character described, a paint gun comprising anair conducting pipe having an elongated substantially narrow outletmouth, a paint conducting plpe arranged lengthwise of said airconducting pipe and provided with an elongated substantially narrowmouth arranged at an angle to the mouth'of the said air pipe and withrelation thereto so as to discharge liquid paint transversely withrelation to the air stream issuing from the mouth of said air conductingpipe, a collar surrounding said pipes and attached thereto, and a nozzledetachably secured to said collar and encircling said pipes to form arelatively large atomizin chamber and provided with an elongatedsubstantially narrow outlet mouth to cause the paint atomizedwitlrinsaid nozzle to be discharged thefefrom in a finer spray.

In testimony whereof, I have signed my name to this specification.

GEORGE L. S'lACKPOLE.

